Support means for oil pipes and electrodes in oil burners



Patented June 21, 1949 SUPPORT MEANS FOR OIL PIPES AND ELECTRODES IN OILBURNER/S Carl E. Schinman, Seattle, Wash.

Application September 16, 1946, Serial No. 697,218

2 Claims. 1

This invention relates to oil burners, and 1t has reference moreparticularly to improvements in oil burners of those types extensivelyused for domestic heating purposes, commonly referred to as electric oilburners and having an air blast tube through which air is forciblydelivered into a combustion chamber and an oil supply tube leadingWithin the blast tube to a nozzle located within or close to thedischarge end oi the air blast tube, and from which nozzle the fuel oilis forcibly delivered in a finely atomized condition for mixing With theair as the mixture enters the combustion chamber.

It is the principal object of this invention to provide an improvedmeans for the support adjustment of the oil delivery tube and the electrodes Within the air blast tube of a burner of the above statedcharacter. Furthermore, to provide a novel mounting or support for theseparts that may be adjusted in an end wise direction thereon to locate itin the most desirable position, and may be easily and readily secured atany adjusted position.

It is also an object of the invention to provide a novel form of supportfor the oil delivery tube and electrodes that serves additionally as ameans for spreading the air stream as delivered through the blast tubeto the outlet and for imparting a spiral whirling action to the airstream as discharged from the tube end.

Yet another object of the invention resides in the provision of asupporting or mounting means for the oil supply pipe and electrodeassembly for use in combination With the aforementioned support, andpermitting an endvvise adjustment of the electrodes and nozzle assembly;this latter support being used to pass` the oil supply tube through thefan housing and to the interior of the v fully described.

En accomplishing the above mentioned and other objects of the invention,I have provided the improved details of construction, the preferredforms of which are illustrated in the accompanydrawings, Wherein-l ,4 Yl n Fig. 1 is a side View of an oil burner embodying which the motor` I4is mounted. It is to be ex- Z. the improvements of the present inventiontherein; a part of the air blast tube being shown in longitudinalsection for better understanding of parts contained Within it.

Fig. 2 is a horizontal section taken substantially on line 2-2 in Fig.1.

Fig. 3 is an enlarged cross sectional vievv taken on line 3 3 in Fig. 1,showing the disposition of the tube and electrode support therein.

Fig. Llis a section taken on line 4-4 in Fig. 3, showing the electrodeclamp and form of the support.

Fig. 5 is an enlarged, horizontal section taken .on the line 5-5 in Fig.1, illustrating the inner end mounting for the oil supply pipe,permitting a limited endvvise adjustment of the electrode wand nozzleassembly in the blast tube.

Referring more in detail to the drawings- The burner with which thepresent improvements have been illustrated, comprises a sheet metal fanhousing lll of involute form, opening at the top to a discharge throatIl' onto which an air blast tube l2 is secured ras a continuation of thethroat. Attached to the housing, at opposits sides, are vertical plates|3-l3, serving as legs for the proper support of the burner.

suitably mounted on a side Wall of the fan housing, as seen in Fig, 1,is an electric motor Ell, and this has its drive shaft I4' extendeddirectlf.y through the fan housing, as illustrated in 'Fig 2, and fixedon this shaft, Within the housing, is a fan it, here shown to be of thesquirrel type, designed for a forcible discharge of air outwardlythrough the blast tube l2 for the purpose of aiding combustion of fuel,as is Well understood in'this art. In Fig. 2 of the drawing, it

is indicated that outside air is being admitted .to the ian housing lllvand to the inside of the vian through an opening l@ form-ed in thatside Wall of the housing that is opposite the Wall on plained, however,that the present improvements l are not dependent upon the use of thisparticular type of fan or housing, and that the present ar- .rangementof housing,` motor and fan, are only illustrative of typical present-dayburners.

Fuel oil is furnished under pressure to the burner through a supply linethat is here shown as leading into thefan housingthrough aside Wallthereof at a point above the fan. The supply line f others and to thesame degree.

comprises a pipe that is exterior of the burner, and a pipe 2| that islocated within the burner and which has a part thereof extendingcoaxially of the blast tube to near its discharge end where it isequipped with a suitable type of oil atomizing nozzle 24. Oil issupplied through the connected pipes 20 and pipe 2| under pressure tothe nozzle to effect its necessary atomization, and this pressure isusually maintained by a pump that is interposed in the supply line andwhich is operated by the motor which drives the fan; the pump for thispurpose, and its connections not being shown in the present drawings.

Extending along opposite sides of the pipe 2| and slightly thereabove,are the electrodes 26-26 which at their outer ends, have terminal points2'! directed toward each other and terminating forwardly of and somewhatabove the nozzle. At their inner ends, the electrodesy are electricallyconnected by flexible leads, indicated .d

at 28, with a source of electricity; the connection being through aswitch, not herein shown, that may be turned on or ofi automatically in:accordance with the operation of the burner, and

as required for the ignition of the fuel charge by the discharge of aspark between the terminals or points; 2l'.

One feature of.' the present invention resides in the provision of anovel form of support for the oil tube 2| and the electrodes within theair blast tube so that the assembly will be held properly located withrespect to the outletv from the blast tube. This particular support ischaracterized by a construction that, in addition' to its supportingfunction',l serves additionally to cause the air stream to leave the'tube nozzle in a spiral, whirling blast that is very desirable from thestandpoint of effecting a good fuel mixture.

The support which is designatedin its entirety by reference numeral S9,has been shown in Figs. 1 and 2` as being located in the blast tubeabout midway of, its length. However, for different burners or fordiierent operating conditions, this support might be advantageouslyplaced at another location. As shown in. Figs. 3 and 4, the supportcomprises a pair of circular, ysaucer-shaped disks :il-3|, each formedwith a fla-t central portion', and a conically sloping peripheral orside wall portion. These disks are complements of each other andoppositely faced and placed with their peripheral edges in registrationand engaged together, and they are .secured together in thisrelationship. In the present instance, I have shown the parts to besecured by the clin-ching of ears which extend from the edge of one partover the edge of the other, as shown in. Fig. 3. Another method or meansof securing these parts would be by spot Welding at `engaged edges. Asjoined, the disks form a hollow, circular body, the shape of which isbest understood by reference to Fig. 4.

Extending from the periphery of the hollow body form-ed by the two disksand at equally spaced angularI intervals thereabout. here shown to be90, are supporting and centering wings 36, each of which is integralwith one of the disks and is bent at an angle to the' axial line of thetube and. in the same direction asA the These wings are adapted toengage along their outer edges with the wall of the blast tube, thus tocenter the support in the'tube', and to define an annular passage` aboutit through which the air stream as delivered from the fan through theblast tube,

will flow with increased speed, and to the tube` end close to the tubewall and by reason of the angular disposition of the wings, will have aspiral whirling motion imparted thereto as the air stream passes to andthrough the discharge end oi the blast tube.

It is shown in Figs. l and 2 that the blast tube is equipped at itsdischarge end with a nozzle portion comprising a conically tapered endportion |22) defining a rather restricted outlet through which the airstream and atomized oil are discharged.

Formed centrally of each of the disks 3l which form the support 30, areopenings 38 through which the oil pipe 2| extends with slight clearance,permitting easy adjustment of the support along the tube. Also formed'in the disks, above and at opposite sides of the center of the disks,are paired openings 39-39 through which the electrodes- 25 extend withclearance for easy adjustment of the support thereon. The support 35 isassembled with the pipe 2| and electrodes before the blast tube isapplied to the fan housand after it has been located at a desiredposition thereon, it is then locked against movenient relative thereto.This locking is accomplished by means of a clamping mechanismcomprising. at dat .plate ilu.' that is1 located within the hollow body30 and underlies the two electrodes as shown in Fig. 3. A clamp screwfil is extended vertically within the support through a top opening 32and is threaded through the plate 49, with its inner edge engagedagainst a metal protective sleeve 3 applied about that portion of thepipe 2| that is` contained between' the opposite sides of the support.

On tightening the screw, the plate 40 will be lifted, and its endportions will. engage and lift the electrodes upwardly and clamp themagainst the top edges of the openings 39' through which they pass and bythis clamping pressure, will hold the electrodes, the pipel 2| and thesupport in a xed relationship.

After the above setting of' the support has been accomplished, then theblast tube l2 is slipped over the support and secured at its inner endto the discharge throat of the housing Il, as indicated in Fig. 2. It ishere shown that the blast tube is telescoped over the throat a shortdistance and fastened thereon by screws 45.

After the blast -tube has been secured in place, it frequently happensthat a iina'l adjustment of the nozzle from or toward the outlet of theblast tube is desirable. This is provided for in the present instance bya novel inner end mounting or" the oil delivery tube 2B.

As shown in Fig. 2, the pipe 2| has a lateral bend at its inner end thatextends outwardly to adjacent the side wall of the fan housing. At thesame level of this laterally turned end of the pipe 2|, the housing isformed with a horizontal slot 46 and overlying the slot, at the outsideof the wall is a cover plate 4T which serves as a support for the oilpipe and also as an adjusting means for the: pipe and electrodeassembly.

y In a preferred arrangement, the laterally .turned end of the pipe 2|is threaded onto a female fitting 5G' having a tubular shank 5| extendedoutwardly through theA horizontal slot 46 in the housing wall andthrough a hole in the cover plate 41 which fits closely about the shank.A shoulder 52 formed on the shank seats against the inside of the coverplate and a nut 53 is threaded onto the shank and is tightened againstthe plate at the outside, thus to secure the fitting rigidly in theplate so that the plate may serve as a mounting for the inner end of thepipe 2l. The oil pressure line 20 then is connected by means of a nipple56 to the outer end of the shank of tting 50.

The cover plate 41 extends horizontally and substantially to oppositesides of the longitudinal slot in the housing and is formed at itsopposite end portions with horizontal slots 58. Screws 59 are extendedthrough these latter slots and threaded into the housing wall. Whenthese screws are loosened, the plate 41 may be adjusted endwise, thus toshift the nozzle and electrode assembly toward and from the end of theblast tube to the extent permitted by the lengths of the slots 58 in theplate. When these screws are tightened, the adjustment will be secured.

With the parts so constructed, the electrode and oil pipe nozzleassembly will be definitely and adjustably supported in the blast tube.Easy adjustment of the assembly from outside the fan housing is possibleand an effective and efcient structure is provided.

Having thus described my invention, what I claim as new therein anddesire to secure by Letters Patent is:

1. In an oil burner having a blast tube, an oil delivery pipe extendingcentrally within the blast tube and a pair of electrodes parallel withthe said pipe; a support for the pipe and electrodes comprising a pairof saucer-shaped disks of the same diameter but of a lesser diameterthan the blast tube, faced in opposite directions and secured edge toedge to form a hollow circular body; said disks having central openingsloosely receiving the pipe therein, wings extending from the peripheryof at least one of said disks and engaging in a supporting contact withWalls of the blast tube to center the support in the tube; said diskshaving paired openings therethrough spaced from the axial line of thebody and receiving said electrodes loosely therein for the slidableadjustment of the support longitudinally of the blast tube, and a clampplate within thev support underlying the electrodes and overlying theoil pipe, and a set screw threaded through the plate and engaged againstthe pipe and adapted to be turned to force the electrodes and pipeagainst the edges of their respective containing openings to hold thesupport against movement.

2. A support as set forth in claim 1 wherein a sleeve is applied to theoil pipe within the supporting housing and said clamp screw engages atits inner end against said sleeve, and said housing having an openingthrough which the outer portion of the clamp screw extends.

CARL E. SCHINMAN.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 2,078,021 Rodler Apr. 20, 19372,310,274 Beckett Feb. 9, 1943 2,370,933 Bortner Mar. 6, 1945 2,405,196Elliot et al. Aug. 6, 1946

